opennlp.tools.sentdetect.lang.th.SentenceContextGenerator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreemnets. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package opennlp.tools.sentdetect.lang.th;
import opennlp.tools.sentdetect.DefaultSDContextGenerator;
/**
* Creates contexts/features for end-of-sentence detection in Thai text.
*/
public class SentenceContextGenerator extends DefaultSDContextGenerator {
public static final char[] eosCharacters = {' ','\n'};
public SentenceContextGenerator() {
super(eosCharacters);
}
protected void collectFeatures(String prefix, String suffix, String previous, String next) {
buf.append("p=");
buf.append(prefix);
collectFeats.add(buf.toString());
buf.setLength(0);
buf.append("s=");
buf.append(suffix);
collectFeats.add(buf.toString());
buf.setLength(0);
collectFeats.add("p1="+prefix.substring(Math.max(prefix.length()-1,0)));
collectFeats.add("p2="+prefix.substring(Math.max(prefix.length()-2,0)));
collectFeats.add("p3="+prefix.substring(Math.max(prefix.length()-3,0)));
collectFeats.add("p4="+prefix.substring(Math.max(prefix.length()-4,0)));
collectFeats.add("p5="+prefix.substring(Math.max(prefix.length()-5,0)));
collectFeats.add("p6="+prefix.substring(Math.max(prefix.length()-6,0)));
collectFeats.add("p7="+prefix.substring(Math.max(prefix.length()-7,0)));
collectFeats.add("n1="+suffix.substring(0,Math.min(1,suffix.length())));
collectFeats.add("n2="+suffix.substring(0,Math.min(2,suffix.length())));
collectFeats.add("n3="+suffix.substring(0,Math.min(3,suffix.length())));
collectFeats.add("n4="+suffix.substring(0,Math.min(4,suffix.length())));
collectFeats.add("n5="+suffix.substring(0,Math.min(5,suffix.length())));
collectFeats.add("n6="+suffix.substring(0,Math.min(6,suffix.length())));
collectFeats.add("n7="+suffix.substring(0,Math.min(7,suffix.length())));
}
}